I have my panel (horizontal) manually positioned at the bottom of the screen (100% length). Several events cause it to get moved to slightly above the middle (the list is probably not exhaustive): - bringing up the panel settings dialog, or making any changes to it - printing something and thus causing the printer queue icon to appear in the indicator area - system updates being detected, causing an icon to appear in the indicator area - pressing CapsLock, causing a change of state of the Kbleds plugin I can drag it back to its intended position at the bottom, and it'll stay there until something happens again. This happens regardless of whether "Lock panel" is selected in the panel settings. Are there any other settings I should check? This started happening a week or two ago, probably due to some update, but I can't pinpoint it, sorry.
More cases: the panel moves when I click on the Applications Menu, Directory Menu, Trash applet, or a launcher. It does NOT move when I click on the Session Menu, Places, the Volume or Wireless icons in the Indicator Plugin, Clipman, DateTime, or WeatherUpdate.
Figured out how to fix it, so I'll leave the info here for future reference: Fixed by changing the y value in the line "<property name="position" type="string" value="p=5;x=683;y=357"/>" in ~/.config/xfconf/xfce-perchannel-xml/xfce4-panel.xml. Before changing the file, quit panel and xfconfd ("xfce4-panel --quit; pkill xfconfd"), then change the file, then restart the panel ("xfce4-panel"). I still don't know how the weird position got into the file in the first place, but if nobody else has this problem, it doesn't matter much.
Can't replace this and there seems to be no one able to replicate it. I think the issue should be closed-